In message  <199606061432.IAA01216@vidiot2.corp.es.com> PICLIST@MITVMA.MIT.EDU
 writes:
> Latest thing to hit me is a temperature controller.  What I'm replacing (this
 is
>  real
> disgusting) is an embedded PC, using a STD CPU card, a A/D and digital output
>  card, plus
[snipity snip]

Yes I have done this. I use a Dallas part, 16C84 at 4Mhz and rs232 at
9600 baud.

The Dallas chips work as per the data books, although I haven't tested
the extremes of their temperature range. The 1-wire interface is not
too hard - I got it going in an evening. I posted the code on the list a
couple of weeks ago. The data rate (as I remember) is abit more than
9600, but less than 19200 baud. Conversion takes 1 second max.

The DS1821 is available in a TO-220 package which lends itself nicely
to being bolted to a heatsink.


Regards,


Mike